So now does the installation determine the flow temperature? If the installation was emphasized, nothing can be changed in the settings anymore? I still don't understand the connection between the flow and the installation of the underfloor heating / heat pump settings.
Of course, that determines the flow temperature - and your insulation standard - transmission heat loss
it couldn't be better.
You adjust the rest with the heat pump.
Your heating technician did a very neat job visually! - Respect!
Ask him - when the time comes - how to set the heat pump so that all heating circuits are open ERR inactive. That would be optimal in terms of efficiency.
When will your ceiling be insulated? If it had been done before the interior plaster, the vapor barrier foil could have been integrated into the gypsum right away.
Or will the ceiling still be suspended with a substructure?
Here I would pay close attention to airtightness again. Otherwise, everything looks great.